CN104607001A - Solar gradient phase change heat storage indirect steam assisted carbon dioxide capture system - Google Patents
Solar gradient phase change heat storage indirect steam assisted carbon dioxide capture system Download PDFInfo
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The invention discloses a solar gradient phase change heat storage indirect steam assisted carbon dioxide capture system of a power plant. The system comprises a power generation sub-system, a carbon dioxide capture sub-system, a gradient phase change heat storage indirect steam generation sub-system and a solar heat collection sub-system, wherein carbon dioxide capture of the power plant and solar heat collection are connected through gradient phase change heat storage to form an integration system; a gas suction and delivery pipe of a steam turbine is connected with a steam pipe of the gradient phase change heat storage indirect steam generation sub-system and an inlet of a reboiler, the solar heat collection sub-system is connected with an inlet of a gradient phase change heat accumulator, and solar heat collection backflow is subjected to heat exchange with condensate through a condensate heating heat exchanger. By means of the gradient phase change heat storage, a heat exchange temperature difference can be kept, the heat exchange effect can be improved, and the solar assistance stability can be improved. Through the connection and reasonable flow distribution and control, efficiency reduction of the power plant due to steam suction is reduced and the whole efficiency of a power generation system is increased while solar assisted carbon dioxide capture of the power plan is realized.
Description
Technical field
The present invention relates to a kind of solar energy auxiliary power plant collecting carbonic anhydride technology, be specifically related to a kind of solar energy cascade phase-transition heat-storage and indirectly produce steam auxiliary power plant carbon dioxide capture system.In utilization, temperature solar heat collector realizes solar energy in conjunction with step heat storage technology and to mate with power plant steam pumping energy complement and carry out collecting carbonic anhydride, while ensureing that heat transfer temperature difference improves heat exchange efficiency by step heat exchange, realize the stable trapping of power plant's carbon dioxide, reduce the steam pumping amount of steam turbine, improve the feed temperature of steam boiler, also can be used for utilizing bleeder steam to carry out accumulation of heat when power load is lower, effectively reduce firepower electrical plant and add brought efficiency and decline in benefits problem due to carbon trapping system.
Background technology
The burning and exhausting of fossil fuel causes the concentration of carbon dioxide in air to increase gradually, and global warming is day by day serious, therefore, controls greenhouse effects and Global climate change, and key is the discharge controlling carbon dioxide.Reclaim separating carbon dioxide and have huge economic benefit and environmental benefit, multiple use can be had by after carbon dioxide purification, not only can be used as the source of carbon, by different reaction paths, the multiple carbon products concerning national economy can also be generated.
As a kind of more ripe carbon dioxide eliminating technology, amine forensic chemistry trapping system has wide market prospects in capturing power plant smoke carbon dioxide, but needed for desorption and regeneration, energy consumption height has become one of its Main Bottleneck promoted of restriction.In solar energy, high-temperature heat-gathering technology is more ripe in China's development, middle high temperature heat collector thermal-arrest temperature section also fit like a glove carbon dioxide desorb time required temperature.
For the cyclophysis of solar energy and carbon dioxide desorb institute calorific requirement feature and characteristic, if solar energy can be realized carry out stable energy supply to carbon dioxide capture system, the reduction of discharging requirement to power plant's carbon dioxide can be realized, regenerative resource can be maximally utilised again, improve the economy of collecting carbonic anhydride, can also reduce simultaneously and add brought efficiency decline problem due to carbon trapping system, and then improve whole efficiency and the benefit of carrying out collecting carbonic anhydride power plant.
Summary of the invention
The object of the invention is: the shortcoming and the deficiencies in the prior art that overcome regenerative resource self, a kind of collecting carbonic anhydride by carrying out power plant to the accumulation of heat of solar energy heating step and power plant's steam pumping cooperation is provided, utilizes medium-temperature collectors backflow to improve the system of the solar energy auxiliary power plant collecting carbonic anhydride of condensing water temperature simultaneously.
Solar energy cascade phase-transition heat-storage of the present invention indirectly produces steam auxiliary power plant carbon dioxide capture system device and comprises: power generation sub-system, collecting carbonic anhydride subsystem, step phase-transition heat-storage produce steam subsystem, middle temperature solar heat collecting subsystem indirectly.Energy and flow-control is carried out by flow control valve, check-valves, by-passing valve, triple valve drain valve and mixing valve etc. between described system; Described power generation sub-system is connected and composed through pipeline and multiple valve combination by steam boiler, steam turbine high-pressure cylinder, Steam Turbine Through IP Admission, turbine low pressure cylinder, condenser, 3 high-pressure feed-water heaters, 4 low pressure condensate water heaters, oxygen-eliminating device, feed pump and generators; Described collecting carbonic anhydride subsystem connects and composes carbon dioxide absorption-desorption cycle system by separator, condenser, compressor, absorption tower, desorber, rich solution circulating pump, lean solution circulating pump, rich or poor liquid heat exchanger, lean solution condenser and reboiler through pipeline and multiple valve combination; Described step phase-transition heat-storage produces steam subsystem indirectly by first order phase change heat storage, second-order phase transistion heat storage, three grades of phase-transition heat-storage bodies ... n level phase-transition heat-storage body and gas-liquid separator connect and compose through pipeline and multiple valve combination; Described middle temperature solar heat collecting subsystem is connected and composed through pipeline and multiple valve combination by solar energy medium-temperature collectors array, heat transfer medium temperature medium circulation pump and condensate water heating heat exchanger.
System of the present invention through in temperature solar heat collecting subsystem thermal-arrest, heat produces steam subsystem indirectly at step phase-transition heat-storage to carry out phase change memory heat through phase change heat storage material and produces steam Transportation to reboiler for providing Desorption of Carbon Dioxide institute calorific requirement; By regulating level Four by-pass valve control, Pyatyi by-pass valve control and six grades by-pass valve control of bleeding of bleeding of bleeding to carry the steam that forms reboiler Desorption of Carbon Dioxide desired parameters through mixing valve from bleeder steam for reboiler and provide desorb heat, flowback steam enters on the condensate pipe between No. 5 low pressure condensate water heaters and No. 6 low pressure condensate water heaters; Thermal release is given condensation backwater through condensate water heating heat exchanger by the conduction oil that in described solar energy, warm thermal-arrest subsystem refluxes from phase-transition heat-storage body, reduces feedwater caloric receptivity in the boiler.
The present invention adds due to carbon dioxide capture system the decline causing power plant efficiency and benefit in order to reduce, and needs characteristic to design according to the power supply characteristic of solar energy and carbon dioxide absorption-desorb.Solar energy heating high temperature section can provide reboiler desorb to consume energy for auxiliary power plant's capturing carbon dioxide, low-temperature zone can improve the temperature of condensate water through condensate water heating heat exchanger, also can carry out accumulation of heat while steam pumping can being utilized to carry out carbon dioxide desorb when solar energy continuous not enough daytime and electricity consumption underload at night.The object arranging step accumulation of heat is in order to the heat transfer temperature difference when heat exchange between maintenance phase-transition heat-storage body and heat transfer medium, thus improves the coefficient of heat transfer and efficiency, strengthens heat transfer effect.The object arranging gas-liquid separator by-passing valve is in order to when night, power load was very low, while meeting energy consumption needed for reboiler Desorption of Carbon Dioxide, more steam can be extracted and carry out accumulation of heat, in order to meet early morning and morning power load uprush but solar energy can not meet energy consumption needed for carbon dioxide desorb again.The object arranging condensate water heating heat exchanger is that the heat-conducting medium that solar energy heating refluxed after accumulation of heat and condensate water carry out heat exchange, improves the temperature of condensate water, thus improves generating efficiency.Arrange level Four bleed by-pass valve control, Pyatyi bleed by-pass valve control, six grades of by-pass valve controls of bleeding, triple valve and mixing valves object be produce the steam of bleeding that matches with reboiler characteristic for providing reboiler Desorption of Carbon Dioxide institute energy requirement.
System of the present invention provides four kinds of mode of operations: when pattern 1 solar energy abundance, while step phase-transition heat-storage produces the accumulation of heat of steam subsystem indirectly, produce steam after middle temperature solar heat collecting subsystem thermal-arrest be supplied to reboiler for carbon dioxide desorb, backflow conduction oil transfers heat to condensate water through condensate water heating heat exchanger; Pattern 2 without solar energy and accumulation of heat can not meet reboiler desorb institute calorific requirement time, produce steam be supplied to reboiler for carbon dioxide desorb by regulating level Four bleed by-pass valve control, six grades of by-pass valve controls of bleeding, triple valve and mixing valves of by-pass valve control, Pyatyi of bleeding; Mode 3 have the sun but amount of radiation is not enough time (cloudy day or haze weather), the sun can not meet reboiler for carbon dioxide desorb energy consumption, by regulate level Four bleed by-pass valve control, Pyatyi bleed by-pass valve control, six grades of by-pass valve controls of bleeding, triple valve and mixing valves produce steam provides reboiler for carbon dioxide desorb, solar energy heating backflow is used for heat-setting water through condensate water heating heat exchanger; Pattern 4 is without solar energy but step phase-transition heat-storage produces steam subsystem quantity of heat storage abundance indirectly, produces steam be supplied to reboiler for carbon dioxide desorb through phase transformation heat release.
Compared with prior art, the invention has the beneficial effects as follows:
1) the latent heat of phase change characteristic making full use of phase change heat storage material and the characteristic utilizing suitable heat transfer temperature difference to increase heat transfer effect carry out step phase-transition heat-storage, produce the steam matched with reboiler Desorption of Carbon Dioxide and carry out carbon dioxide desorb, both the heat exchange efficiency in heat transfer process had been improved, take full advantage of regenerative resource again, improve reliability and the guarantee degree of solar energy.
2) accumulation of heat not enough or night, power load was less time, reboiler can be supplied to for while carbon dioxide desorb by steam pumping, also can carry out accumulation of heat, with meet power load uprush and solar energy is not enough time carbon dioxide desorb needed for energy consumption.
3) cloudy day or haze weather solar energy more weak time, steam pumping can be carried out and be supplied to reboiler for carbon dioxide desorb, solar energy heating is used for heat-setting water through the heat exchange of condensate water heating heat exchanger, reduces power plant because of steam pumping and carries out the problem of the decrease in power generation efficiency that collecting carbonic anhydride causes.
Accompanying drawing explanation
Fig. 1 is system principle of the present invention and structure composition schematic diagram.
Detailed description of the invention
Below in conjunction with Fig. 1, the technical scheme of system of the present invention is conducted further description.
A kind of solar energy cascade phase-transition heat-storage of the present invention produces steam auxiliary power plant carbon dioxide capture system indirectly as Fig. 1 system principle and structure
Comprise power generation sub-system, collecting carbonic anhydride subsystem, step phase-transition heat-storage produce steam subsystem and middle temperature solar heat collecting subsystem indirectly.
Described power generation sub-system (1) is connected and composed through pipeline and multiple valve combination by steam boiler A1, steam turbine high-pressure cylinder A2, Steam Turbine Through IP Admission A3, turbine low pressure cylinder A4, condenser A5,3 high-pressure feed-water heater A6-A8,4 low pressure condensate water heater A9-A12, oxygen-eliminating device A13, feed pump A14, generators; Bleed by-pass valve control V1, Pyatyi of level Four is bled by-pass valve control V2, six grades of the by-pass valve control V3 that bleed, mixing valve V4 rates of air sucked in required, produce steam by triple valve and mixing valve and be supplied to reboiler for carbon dioxide desorb, reboiler outlet is connected with six grades of heater A10 entrances;
Described collecting carbonic anhydride subsystem 2 connects and composes absorption-desorption cycle system by separator B1, condenser B2, compressor B3, absorption tower B4, desorber B5, rich solution circulating pump B6, lean solution circulating pump B7, rich or poor liquid heat exchanger B8, lean solution condenser B9 and reboiler B10 through pipeline and multiple valve combination, flue gas is successively through separator B1, condenser B2, compressor B3 enters bottom the B4 of absorption tower, poor amine aqueous solution is extracted out after absorbing carbon dioxide in the B4 of absorption tower bottom the B4 of absorption tower, after rich or poor liquid interchanger B8 heat exchange temperature raise after from the desorb of desorber B5 top spray, desorber B5 bottom reboiler B10 provides desorb institute calorific requirement, poor amine aqueous solution after desorb is drawn through lean solution circulating pump B7 and is sent to temperature after rich or poor liquid heat exchanger B8 heat exchange and reduces bottom desorber B10, reach after entering the further heat release of lean solution condenser B9 and absorb controling parameters and enter absorption tower B4 and carry out cyclic absorption carbon dioxide, flue gas after carbon dioxide removal is discharged by B4 top, absorption tower, carbon dioxide after separation compresses stand-by after desorber B5 top distillates.
Described step phase-transition heat-storage produces steam subsystem 3 indirectly by first order phase change heat storage C1, second-order phase transistion heat storage C2, three grades of phase-transition heat-storage body C3 ... n level phase-transition heat-storage body Cn and gas-liquid separator C0 connects and composes through pipeline and multiple valve combination; Described system phase-change material used is middle-temperature section phase change heat storage material, and can be organic phase change material or inorganic phase-changing material, phase transition temperature be between 100-150 DEG C.The phase-change material of different phase transition temperature is filled respectively in heat storage, according to phase transition temperature from height to low setting of contacting successively, mutually isolated without heat and mass between heat storage; The low-temperature inlet producing steam side is connected with reboiler, after three grades of phase-transition heat-storage body C4 and second-order phase transistion heat storage C3, enter gas-liquid separator produce steam, steam enters reboiler B10 and provides carbon dioxide desorb institute calorific requirement after entering first order phase change heat storage C2 reheating, gas-liquid separator C1 is connected to gas-liquid separator by-passing valve V6.
Described middle temperature solar heat collecting subsystem 4 is connected and composed through pipeline and multiple valve combination by solar energy medium-temperature collectors array D1, heat transfer medium temperature medium circulation pump D2 and condensate water heating heat exchanger D3; Described system heat transfer medium used can be high temperature heat conductive oil, water, fuse salt or high temperature fluid transmission medium in other.
Described system is exported by solar energy medium-temperature collectors array D1 and is connected with heat transfer medium temperature medium circulation pump D2, heat transfer medium temperature medium circulation pump D2 outlet indirectly produces steam subsystem 3 accumulation of heat side first order phase change heat storage C1 entrance with step phase-transition heat-storage and is connected, solar energy medium-temperature collectors array D1 entrance and step phase-transition heat-storage indirectly produce steam subsystem 3 accumulation of heat side n level phase-transition heat-storage body Cn and export and be connected, the heat that medium-temperature collectors array D1 produces is passed to step phase-transition heat-storage through heat transfer medium and is indirectly produced steam subsystem 3 phase change heat storage material, reaches the object of energy storage; Described condensate pump (A14) exports extension condensate water and is connected to condensate water heating heat exchanger (D3) low temperature side entrance, the outlet of condensate water heating heat exchanger (D3) low temperature side connects on the condensate pipe between No. 5 low pressure condensate water heaters (A10) and No. 6 low pressure condensate water heaters (A11), is reached the object of heating part condensate water by the heat exchange of condensate water heating heat exchanger (D3).
Solar energy cascade phase-transition heat-storage of the present invention produces steam auxiliary power plant carbon dioxide capture system indirectly can be divided into four kinds of mode of operations according to solar energy and phase-transition heat-storage body accumulation of energy situation.
Pattern 1: when solar energy abundance, steam subsystem 3 accumulation of heat is indirectly produced through step phase-transition heat-storage after middle temperature solar heat collecting subsystem 4 thermal-arrest, the steam side simultaneously indirectly producing steam subsystem 3 through step phase-transition heat-storage produces steam and is supplied to reboiler for carbon dioxide desorb, recirculating heat transfer medium enters middle temperature solar heat collecting subsystem 4 low-temperature inlet after condensate water heating heat exchanger D3 transfers heat to condensate water, thermal-arrest-accumulation of heat circulation is again carried out after heat temperature raising in collector array D1, in described system, valve switch state is: V5, V8, V9, V10 opens, V1, V2, V3, V4, V6, V7 closes.
Pattern 2: without solar energy and accumulation of heat is not enough time, middle temperature solar heat collecting subsystem 4 and step phase-transition heat-storage produce steam subsystem 3 indirectly can not meet reboiler desorb heat dissipation, the steam mated with reboiler desorption properties is produced by regulating level Four bleed by-pass valve control V2, the six grades of by-pass valve control V3 and mixing valve V4 that bleed of by-pass valve control V1, Pyatyi that bleed, steam enters reboiler for carbon dioxide desorb, and the steam after reboiler heat release enters six grades of feed-water heater A10.If now power load is very low, accumulation of heat can also be carried out by Open valve V5 and gas-liquid separator by-passing valve V6 to heat storage, when in described system, valve switch state is for carrying out bleeding accumulation of heat: V1, V2, V3, V4, V5, V6, V7, V10 open, V8, V9, pass, when not carrying out bleeding accumulation of heat: V1, V2, V3, V4, V7, V10 open, V5, V6, V8, V9 close.
Mode 3: cloudy day or haze weather when having the sun but thermal characteristics needed for desorb can not be met, solar energy can not meet reboiler for carbon dioxide desorb energy consumption, now by regulating level Four to bleed by-pass valve control, Pyatyi is bled by-pass valve control, six grades of bleed by-pass valve control and mixing valves produce steam provides reboiler for carbon dioxide desorb common mode 2, solar thermal collection system work simultaneously, heat transfer medium after medium-temperature collectors permutation D1 heats is in condensate water heating heat exchanger D3 heat exchange, for heat-setting water, improve condensing water temperature, thus raising generating efficiency, in described system, valve switch state is: V1, V2, V3, V4, V7, V8, V9, V10 opens, V5, V6 closes.
Pattern 4: without solar energy but step phase-transition heat-storage indirectly produces steam subsystem 3 and accumulation of energy meets and produces required steam needs, producing steam through system phase transformation heat release provides reboiler B10 for carbon dioxide desorb, when in described system, valve switch state is for carrying out bleeding accumulation of heat: V5, V8, V9, V10 open, V1, V2, V3, V4, V6, V7 close.
In described system, temperature solar heat collecting subsystem 4 can indirectly produce steam subsystem 3 through step phase-transition heat-storage and produces steam and be used for providing CO2 desorb heat dissipation, also can transfer heat to condensate water for improving the temperature of condensate water by condensate water heating heat exchanger, and then improve boiler efficiency.
Described step phase-transition heat-storage produces steam subsystem 3 indirectly can be supplied to reboiler B10 for Desorption of Carbon Dioxide through gas-liquid separator C1 generation steam, also can be lower in power load, steam pumping meets energy consumption needed for carbon dioxide desorb when also having superfluous, open gas-liquid separator by-passing valve V6 by gas-liquid separator C1 short circuit, and Open valve V5, now step phase-transition heat-storage produces steam subsystem 3 steam side indirectly as accumulation of heat side to phase change heat storage material heat release, and described step phase-transition heat-storage indirectly produces steam subsystem 3 and carries out accumulation of heat.
The present invention is not limited to above-mentioned detailed description of the invention, and the related personnel of this area is not when departing from present system form, and the Operation and control mode altering made all belongs within protection of the present invention.
Claims (4)
1. solar energy cascade phase-transition heat-storage indirect steam auxiliary carbon dioxide trapping system, comprising: power generation sub-system (1), collecting carbonic anhydride subsystem (2), step phase-transition heat-storage produce vapour system (3), middle temperature solar heat collecting subsystem (4) indirectly; Described said system pipeline is provided with multiple multiple valve, includes gate valve, check-valves, triple valve, drain valve and mixing valve etc., it is characterized in that:
Described power generation sub-system (1) is connected and composed through pipeline and multiple valve combination by steam boiler (A1), steam turbine high-pressure cylinder (A2), Steam Turbine Through IP Admission (A3), turbine low pressure cylinder (A4), condenser (A5), 3 high-pressure feed-water heaters (A6-A7), 4 low pressure condensate water heaters (A9-A12), oxygen-eliminating device (A13), condensate pump (A14), generators (A15);
Described collecting carbonic anhydride subsystem (2) is connected and composed through pipeline and multiple valve combination by separator (B1), condenser (B2), compressor (B3), absorption tower (B4), desorber (B5), rich solution circulating pump (B6), lean solution circulating pump (B7), rich or poor liquid heat exchanger (B8), lean solution condenser (B9) and reboiler (B10);
Described step phase-transition heat-storage indirectly produces steam subsystem (3) and is connected and composed through pipeline and multiple valve combination by first order phase change heat storage (C1), second-order phase transistion heat storage (C2), three grades of phase-transition heat-storage bodies (C3), n level phase-transition heat-storage body (Cn) and gas-liquid separators (C0);
Described middle temperature solar heat collecting subsystem (4) is connected and composed through pipeline and multiple valve combination by solar energy medium-temperature collectors array (D1), heat transfer medium temperature medium circulation pump (D2) and condensate water heating heat exchanger (D3);
Described system also comprises by-pass valve control: level Four is bled by-pass valve control (V1), Pyatyi is bled by-pass valve control (V2), six grades of by-pass valve controls of bleeding (V3), mixing valve (V4), heat-accumulator tank steam control valve (V5), gas-liquid separator by-passing valve (V6), circuit controls of bleeding valve (V7), condensate water is drawn water by-pass valve control (V8), the drain valve that low pressure condensate water circuit controls valve (V9) and described system equipment carry, other related valves such as check-valves,
Connect step phase-transition heat-storage described in described middle temperature solar heat collecting subsystem (4) hot outlet connects and indirectly produce steam subsystem (3) high-temperature level entrance, transfer heat to described step phase-transition heat-storage indirectly to produce steam subsystem (3) and store and produce steam, described step phase-transition heat-storage indirectly produce steam subsystem (3) steam (vapor) outlet side connect collecting carbonic anhydride subsystem (2) reboiler (B10) entrance by delivered heat to reboiler (B10), for providing Desorption of Carbon Dioxide institute calorific requirement; Described condensate pump (A14) exports extension condensate water and is connected to condensate water heating heat exchanger (D3) low temperature side entrance, and the outlet of condensate water heating heat exchanger (D3) low temperature side connects on the condensate pipe between No. 5 low pressure condensate water heaters (A10) and No. 6 low pressure condensate water heaters (A11).The low temperature reflux of described middle temperature solar heat collecting subsystem (4) is through condensate water heating heat exchanger (D3) heat exchange, described power generation sub-system (1) is bled from level Four, Pyatyi bleed and six grades bleed and to bleed by-pass valve control (V1) through described level Four, Pyatyi is bled by-pass valve control (V2), six grades of by-pass valve controls of bleeding (V3) are connected to reboiler (B10) entrance of described collecting carbonic anhydride subsystem (2), described system to be bled by-pass valve control (V1) by adjustment level Four when accumulation of heat is not enough or power load is lower, Pyatyi is bled by-pass valve control (V2), six grades of by-pass valve controls of bleeding (V3) and mixing valve (V4) carry out bleeding provides desorb titanium dioxide tower institute calorific requirement, also can open described step phase-transition heat-storage indirectly to produce the heat-accumulator tank steam control valve (V5) of steam subsystem (3) and gas-liquid separator by-passing valve (V6) and combine and carry out accumulation of heat to phase-transition heat-storage body simultaneously, described system is when the not enough weather (haze or cloudy day) of solar energy, middle temperature solar heat collecting subsystem (4) heat is used for improving condensing water temperature through condensate water heating heat exchanger (D3) heat exchange, and reboiler (B10) institute calorific requirement provides through bleeding,
Described step phase-transition heat-storage indirectly produces steam subsystem (3) and utilizes step accumulation of heat can ensure heat transfer temperature difference enhancing heat transfer effect, increase reliability and the fraction of solar energy, can be used for carrying out accumulation of heat to described power generation sub-system (1) bleeding when power load is lower simultaneously, also can improve condensing water temperature through condensate water heating heat exchanger (D3) heat exchange.
2. a kind of solar energy cascade phase-transition heat-storage according to claim 1 produces steam auxiliary power plant carbon dioxide capture system indirectly, it is characterized in that described step phase-transition heat-storage produces steam subsystem (3) is indirectly be composed in series according to phase transition temperature height by multistage different phase transition temperature energy-accumulation material, every grade of heat storage phase-change material used is the phase-change material that phase transition temperature is different, and it is identical with the required steam parameter of reboiler (B10) that high-temperature level exports the steam produced.
3. a kind of solar energy cascade phase-transition heat-storage according to claim 1 produces steam auxiliary power plant carbon dioxide capture system indirectly, it is characterized in that described step phase-transition heat-storage indirectly produces steam subsystem (3) and can be bled by power plant and carry out accumulation of heat.
4. a kind of solar energy cascade phase-transition heat-storage according to claim 1 produces steam auxiliary power plant carbon dioxide capture system indirectly, it is characterized in that described middle temperature solar heat collecting subsystem (4) improves the feed temperature of steam boiler (A1) through condensate water heating heat exchanger (D3).
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